Patchouli Knowledge is a very smart, asthmatic magician from the Scarlet Devil Mansion. She spends most of her time in the mansion's library reading and writing magic books. It seems that she's capable of very powerful magic of all kinds, using many elements in a single spell, but due to asthma and general poor health she's often unable to recite her spells. . .

. . .But that doesn't stop her from kicking your ass in game.